According to Alla Indium ore drops in Grieg's End and Rhenium drops in PoV and Stillmoon Temple off the most number of mobs. Are these the best places to farm this stuff or does anyone know a better place to get these types of ore at? Thanks.

From what I've seen, it isn't the zone but the level of the mobs you kill. A certain level drops a certain level of the tradeskill stuff. Pretty sure any mobs within that range will drop what you need.